I have a 87 chevy half ton truck that had a tbi 4.3 and I put a 85 350 4 barrel in it
I put a block off plate on the motor for the mechanical fuel pump and put a fuel
Regulator on it put a edelbrock proformer eps intake on it and a manual choke
600 cfm edelbrock carb all brand new wires plugs cap and rotor but when I start it
I pull the choke it will run great for a few seconds then die and won't restart until I
Wait about 10 minutes I have fought with it and am now seeking help
Any ideas?

Did you also install a fuel pressure gauge?
Are you certain you even need the choke to start it?
Are you sure the butterflies aren`t icing over? If they are it`ll flood so severely you have to wait a while before it evaporates.
When trying to restart a flooded engine, do not use the choke and put the gas pedal to the floor.

Once it fires you need to push the choke in a little or you will flood it instantly. This sounds like your issue, after 10 minutes or so it will dry out and start again.
Try this, pull the choke only half way and pump it 3 or 4 times and start it. See if it continues to run.

__________________
Artificial Intelligence is no match for Natural Stupidity

Thanks for all the input I got it running and feel pretty stupid I had to throw the choke open right after the motor catches. Well I feel like a dummy but at least my wife will be happy the truck is running again. Thank you

It sounds more like the carb is running out of gas than flooding. check the fuel pressure and then look at the float level. The engine will run until the carburator runs out of gas and then the pump will fill it back up and it will run again. Likely float

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